Fuel pump parked up hill

If I park the Duster facing up hill, even as slight a pitch as my own driveway, the car will not start. Fuel

If it is parked down hill or level, she starts just fine.
I filled it up at the gas station today, and it was pitched up hill. She would not start. I let her roll backwards to level ground, it starts just fine.

I figure it is the fuel pump, It was new in May of last year.
should I go electric or mechanical???

Ed